Boundary apparatus and method for establishing the network connection using a resource reserving function

DETAILED DESCRIPTION Accordingly, it is an object of the present invention to eliminate the above-described problems in the related art and to avoid the exhaustion of the SVC resource (VPI/VCI resource) in an ATM network and reduce the number of times of setting an SVC even if the bandwidth BWs recommended by a transmitting terminal and the bandwidth BWr required by a receiving terminal changes.
It is another object of the present invention to enable the optimum combination of a point-point connection (p-p connection and a point-multipoint connection (p-mp connection) in an ATM network to be selected when an IP packet is transmitted to a plurality of receivers which require different bandwidths.
It is still another object to enable the optimum connection to be established with consideration for the resource (VPI/VCI resource and the bandwidth resource) usage state between the boundary apparatus on the transmission side in which the exhaustion of the tag resource (VPI/VCI) and the bandwidth resource is the largest and an ATM switch which is connected to the boundary apparatus.
It is a further object of the present invention to enable the optimum connection for data transfer service to be established in an ATM network with consideration for the effective bandwidth usage ratio of not only the bandwidth between the boundary apparatus on the transmission side and an ATM switch which is connected thereto but also the bandwidth used by another ATM switch in the ATM network, i.
e.
, the effective bandwidth usage ratio of the entire ATM network.
It is a further object of the present invention to instruct the separation of an existent connection in a case where the separation of the existent connection increases the effective bandwidth allocation ratio in an ATM network.
It is a still further object of the present invention to suppress the separation or re-establishing of a connection in a state in which the number of reservation requests from receivers rapidly changes, for example, at the time of starting a data transmitting session and at the time of changing contents, thereby preventing an increase in the amount of signaling message in an ATM network and lightening the signaling processing load on not only a boundary apparatus but also each ATM switch